NTFS: - In fs/ntfs/compress.c, use i_size_read() at the start and then use the

	cached value everywhere.  Cache the initialized_size in the same way
	and protect the critical region where the two sizes are read using the
	new size_lock of the ntfs inode.
      - Add the new size_lock to the ntfs_inode structure (fs/ntfs/inode.h)
	and initialize it (fs/ntfs/inode.c).

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
index 6d2a99c13d30..97c4fe932046 100644
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -34,6 +34,13 @@ ToDo/Notes:
         - Use i_size_read() once and then use the cached value in
           fs/ntfs/lcnalloc.c::ntfs_cluster_alloc().
         - Use i_size_read() in fs/ntfs/file.c::ntfs_file_open().
+        - Add size_lock to the ntfs_inode structure.  This is an rw spinlock
+          and it locks against access to the inode sizes.  Note, ->size_lock
+          is also accessed from irq context so you must use the _irqsave and
+          _irqrestore lock and unlock functions, respectively.
+        - Use i_size_read() in fs/ntfs/compress.c at the start of the read and
+          use the cached value afterwards.  Cache the initialized_size in the
+          same way and protect access to the two sizes using the size_lock.
 
 2.1.22 - Many bug and race fixes and error handling improvements.